ADS122C04 4-Wire RTD Schematic design check

Temperature measurement range -200℃——100℃

Hello， about the schematic of ADS122C04, you could refer to the EVM user's guide Page42.
www.ti.com.cn/.../sbau297.pdf
About the power supply, we recommend LDO, because battery is not used for a long time, the EVM recommend to use TPS71718 to provide the power supply.

I've already seen the EVM user's guide, but I've noticed that the design is a bit different from the spec design, and the user's guide seems to be more complex.I'm not sure I understand about the power supply, in fact the electricity from the LDO is also converted past the battery voltage; but the battery voltage changes over the course of use and I don't know if that will have any effect!

Can you help me confirm the schematic I uploaded?EVM reference design is too difficult for me.

Hello, can you help me confirm the schematic diagram uploaded earlier?

Hello, I  have confirmed the circuit of ADS122C04, I didn't recommend the RESET pin connect the VCC_3.3V directly,  it could connect the GPIO of MCU, because it need to meet the power up and down timing, that is to say, during power up, the RESET is from low to high, and during power down, the RESET is form high to low,  it isn't always high, so it need to modify. As to the 4 wire RTD input   and the external reference  schematic, it has no problem,  and the EVM user's guide has provided the detailed circuit, you could review again.

Thanks for your reply. I don't have enough pin to connect rest .I see the specs say so ‘ tie the RESET pin to DVDD if the RESET pin is not used ’.

OK,Thanks for your reply.There's one more thing I want to make sure.When using 4-Wire RTD, is the AIN2 pin to be NC?

unused pin could be floated directly.  Please refer to the 4 wire RTD input diagram. 

Thanks for the reply, I was wondering which document your screenshot above is from.Can you release it to me?

I want to confirm that there is a difference between the spec and the demo board about RREF and whether this resistor is needed

Do you have an answer for me?

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